JPH0748977Y2 - Cooling equipment for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention mainly relates to a cooling device for an engine room by air of construction machines, work vehicles and the like.

2. Description of the Related Art FIG. 6 is a perspective view of a hydraulic excavator equipped with a cooling device 1 of the related art, as viewed from the rear side. In the figure, 2 is a lower traveling body of the hydraulic excavator, 3 is an upper swing body, 4 is an engine mounted on the upper swing body 3, 5 is a cooling fan driven by the engine 4, 6 is a radiator, 7 is a hydraulic pump, 8
Is a hydraulic oil tank, 9 is a counterweight attached to the rear end of the upper swing body 3, 10 is a guard plate that covers the left and right side surfaces and the upper surface of the rear portion of the upper swing body 3, and 11 is an air hole formed in the guard plate 10. Inlet, 12 and 13 are outlets, and 14 is guard plate 1
0, a counterweight 9 and the like, and an engine room in which the engine 4 is mounted.

Next, the configuration of the conventional cooling device 1 will be described with reference to FIG. In a hydraulic excavator equipped with a cooling device 1 of the prior art, the engine compartment 14 is formed by surrounding it with a guard plate 10, a counterweight 9 and the like, and the guard plate 10 has an air intake port.
11 and outlets 12 and 13 are provided. A mesh member or a punching plate is attached to the suction port 11 and the discharge ports 12 and 13 to prevent foreign matters such as pebbles from entering the engine compartment 14. Therefore, when the hydraulic excavator is working, the outside air is sucked in through the intake port 11 as indicated by the arrow a due to the rotation of the cooling fan 5, and the space between the radiator fins (a part through which the air of the radiator 6 passes, but not shown), the engine room After passing through 14, the gas is discharged from the discharge ports 12 and 13 as indicated by arrows B and C. As a result, heat exchange is performed while the air is passing between the radiator fins and the engine compartment 14,
It is possible to lower the radiator water temperature and the hydraulic oil temperature.

Problems to be Solved by the Invention In the cooling device of the prior art, mesh members and punching plates are attached to the air inlet and outlet provided on the guard plate. It was always open. Therefore, even when the engine is started, the cool air from the outside is sucked into the engine compartment by the cooling fan, which requires a long warm-up time. This tendency was severe in cold weather, which hindered the start of work. Also, since the intake and exhaust ports are always open, engine noise was large and noise pollution sometimes occurred even during late night work when the temperature was low.

It is an object of the present invention to solve the above problems and to provide a cooling device in which a louver mechanism is provided at an air intake port and an air outlet port and the louver opening / closing angle of the louver mechanism is controlled.

Means for Solving the Problems The means of this invention taken to solve the above problems are: A detecting means for detecting the water temperature of the radiator, a detecting means for detecting the oil temperature of the hydraulic oil, and a detecting means for detecting the amount of air passing through the radiator fins; In addition, a louver mechanism with actuators for opening and closing is attached to the air inlet and outlet, and c. On the other hand, set the louver opening angle group corresponding to the radiator water temperature, hydraulic oil temperature, and air volume passing between radiator fins. When the engine is operating, the controller outputs a command signal to the opening / closing actuator of the louver mechanism based on the detection signal from the detecting means.

Action a. The louver opening angle group corresponding to the radiator water temperature, the hydraulic oil temperature, and the air flow between radiator fins has a small louver opening angle when the radiator water temperature, the hydraulic oil temperature, and the air flow between radiator fins are low. In the case of, it is set to be large. The louver opening angle group is previously stored in the memory of the controller.

B. When the engine is running, the temperature sensor for radiator water temperature,
Detection signals from the temperature sensor for hydraulic oil temperature and the air volume sensor for passing air between radiator fins are input to the controller. The controller makes a determination based on the detection signal, and outputs a command signal to the opening / closing actuator of the louver mechanism. Thereby, the louver mechanism is automatically adjusted to the optimum louver opening angle at that time.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a rear view of a hydraulic excavator including a cooling device 15 according to the present invention, with a main portion cut away. In the figure,
The same reference numerals are given to those using the same components as those of the conventional art. 3'is an upper revolving structure, 10 'is a gart plate that covers the left and right side surfaces and the upper surface of the rear part of the upper revolving structure 3', 16 is an air intake port formed in the guard plate 10 ', and 17 and 18 are exhausted respectively. An outlet, 19 is an engine room surrounded by a guard plate 10 ', etc. and in which the engine 4 is mounted, 20 is a radiator fin of a radiator 6, and 21, 22 and 23 are inlets 16, 16 respectively.
A louver mechanism attached to the discharge ports 17 and 18. FIG. 2 is an enlarged view showing the louver mechanism 23 in the A portion of FIG. In the figure, 24 is a louver of the louver mechanism 23, and 25 is a louver.
Is a cylinder as an actuator (cylinder, motor, etc.) for opening and closing the louver 24. Figure 3 shows
It is a block diagram showing a configuration of a cooling device 15 according to the present invention. In the figure, 26 is a temperature sensor provided to detect the water temperature of the radiator 6, 27 is a temperature sensor provided to detect the oil temperature of the hydraulic oil, and 28 is air passing between the radiator fins 20. An air flow sensor provided to detect the air flow rate of the device, 29 is a controller, 30 is a memory of the controller, and 31 is a cylinder control valve that controls the operation of the louver opening / closing cylinder 25. FIG. 4 is a sectional view showing a closed state of the louver mechanism 23 (that is, a state where the louver opening angle is 0). FIG. 5 is a partially cutaway plan view seen from B of FIG.

Next, the configuration of the cooling device 15 according to the present invention will be described with reference to FIGS. Although the louver mechanism is provided at a plurality of locations, the louver mechanism 23 has the same configuration and function, and therefore the louver mechanism 23 will be described as a representative. It is provided with a detecting means for detecting the water temperature of the radiator 6, a detecting means for detecting the oil temperature of the hydraulic oil, and a detecting means for detecting the amount of air passing through the radiator fins 20, and for opening and closing the air intake and exhaust ports. A louver mechanism 23 equipped with an actuator (cylinder 25) was attached. On the other hand, the louver opening angle group corresponding to the radiator water temperature, the hydraulic oil temperature, and the air volume passing through the radiator fins is set, and when the engine 4 is operating, based on the detection signal from the detecting means, the controller 29 controls the louver opening / closing cylinder. A command signal is output to the control valve 31. In the cooling device 15 according to the present invention, the louver mechanism is attached to the air inlet port and the air outlet port, but a lid applying mechanism, a door applying mechanism (not shown) or the like may be attached instead.

Next, the function and function of the cooling device 15 according to the present invention will be described. The louver opening angle group corresponding to the radiator water temperature, the hydraulic oil temperature, and the air flow between radiator fins is small and high when the radiator water temperature, the hydraulic oil temperature, and the air flow between radiator fins are low. The value is set to be large. The louver opening angle group is stored in the memory 30 of the controller 29 in advance. Therefore, when the engine 4 is operating, detection signals from the radiator water temperature sensor 26, the hydraulic oil temperature sensor 27, and the air flow sensor 28 for passing air between the radiator fins are input to the controller 29. The controller 29 makes a determination based on the above detection signal, and outputs a command signal to the cylinder control valve 31 for louver opening / closing control. Thereby, the louver mechanism is automatically adjusted to the optimum louver opening angle at that time.

Effect of the Invention In the cooling device according to the present invention, the louver mechanism is provided with detecting means for detecting the radiator water temperature, the hydraulic oil temperature, and the air volume passing through the radiator fins, and the opening and closing actuators for air intake and exhaust. On the other hand, the louver opening angle group corresponding to the radiator water temperature, the hydraulic oil temperature, and the air volume passing through the radiator fins is stored in the memory of the controller. Based on the detection signal from the above-mentioned detection means when the engine is operating, the louver mechanism is A command signal is output to the opening and closing actuator. As a result, when the radiator water temperature and hydraulic oil temperature are low, for example, when the engine is idling at the time of starting the engine, the louver mechanism is automatically closed or adjusted to a small louver opening angle. Therefore, the warm-up time can be shortened, and
Engine noise can be reduced.

Therefore, in the construction machine equipped with the cooling device according to the present invention, the louver opening angle is automatically adjusted when the engine is operating to cool the engine and the radiator.
It shortens the warm-up time, brings economic benefits, and helps reduce engine noise.

[Brief description of drawings]

FIG. 1 is a rear view of a hydraulic excavator equipped with a cooling device according to the present invention, showing a cutaway view of a main part, FIG. 2 is an enlarged view showing a louver mechanism in a portion A of FIG. 1, and FIG. FIG. 4 is a block diagram showing the structure of the apparatus, FIG. 4 is a sectional view showing the louver mechanism in a closed state, FIG. 5 is a partially cutaway plan view seen from B of FIG. 4, and FIG. It is a hydraulic excavator equipped with a device. 1,15 …… Cooling device 4 …… Engine ・ 5 …… Cooling fan 6 …… Radiator ・ 10,10 ′ …… Guard plate 11,16 …… Suction port 12,13,17,18 …… Discharge port 14, 19 …… Engine compartment 20 …… Radiator fin 21,22,23 …… Louver mechanism 25 …… Louver opening / closing cylinder 26,27 …… Temperature sensor 28 …… Air flow sensor ・ 29 …… Controller

Claims (1)

[Scope of utility model registration request] 1. A construction machine in which an engine room is surrounded by a guard plate, an air inlet and an air outlet are provided in the guard plate, and air is passed between a radiator fan and an engine room by a cooling fan. In the above, a detection means for detecting the water temperature of the radiator, a detection means for detecting the greenhouse of the hydraulic oil, and a detection means for detecting the amount of air passing through the radiator fins are provided, and the opening and closing actuators are provided at the air intake and exhaust ports. A louver mechanism equipped with a louver mechanism is installed, while a louver opening angle group corresponding to the radiator water temperature, hydraulic oil temperature, and air volume passing through the radiator fins is set. A cooling device for a construction machine, which is configured to output a command signal to an opening / closing actuator of a mechanism.